The Audi SQ8 (4M) 4.0 TDI V8 quattro Tiptronic represents a high-performance iteration of Audi’s Q8 SUV, produced from 2019 to 2020. Positioned as the performance variant within the Q8 range, it slots above the standard Q8 and below the even more focused RS Q8. This model aimed to deliver a blend of luxury, practicality, and substantial performance, appealing to buyers seeking a sporty SUV experience. It is built on the MLB Evo platform, shared with other Volkswagen Group vehicles like the Porsche Cayenne and Lamborghini Urus.
Technical Specifications
| Brand | Audi |
| Model | SQ8 |
| Generation | SQ8 (4M) |
| Type (Engine) | 4.0 TDI V8 (435 Hp) quattro Tiptronic |
| Start of production | 2019 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 8.9-9.3 l/100 km (26.4 – 25.3 US mpg, 31.7 – 30.4 UK mpg, 11.2 – 10.8 km/l) |
| CO2 emissions (WLTP) | 232-243 g/km |
| Fuel consumption (economy) – urban | 8.6 l/100 km (27.4 US mpg, 32.8 UK mpg, 11.6 km/l) |
| Fuel consumption (economy) – extra urban | 7.2-7.3 l/100 km (32.7 – 32.2 US mpg, 39.2 – 38.7 UK mpg, 13.9 – 13.7 km/l) |
| Fuel consumption (economy) – combined | 7.8 l/100 km (30.2 US mpg, 36.2 UK mpg, 12.8 km/l) |
| CO2 emissions | 204-205 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 5.4 kg/Hp, 183.9 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 380.5 Nm/tonne |
| Power | 435 Hp @ 3750-4750 rpm |
| Power per litre | 110 Hp/l |
| Torque | 900 Nm @ 1250-3250 rpm (663.81 lb.-ft. @ 1250-3250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DMVA |
| Engine displacement | 3956 cm3 (241.41 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 91.4 mm (3.6 in.) |
| Compression ratio | 16:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Engine oil capacity | 8.8 l (9.3 US qt | 7.74 UK qt) |
| Coolant | 14.8 l (15.64 US qt | 13.02 UK qt) |
| Kerb Weight | 2365 kg (5213.93 lbs.) |
| Max. weight | 3100 kg (6834.33 lbs.) |
| Max load | 735 kg (1620.4 lbs.) |
| Trunk (boot) space – minimum | 605 l (21.37 cu. ft.) |
| Trunk (boot) space – maximum | 1755 l (61.98 cu. ft.) |
| Fuel tank capacity | 85 l (22.45 US gal | 18.7 UK gal) |
| AdBlue tank | 24 l (6.34 US gal | 5.28 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (8%) | 3500 kg (7716.18 lbs.) |
| Permitted trailer load with brakes (12%) | 3500 kg (7716.18 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 150 kg (330.69 lbs.) |
| Length | 5006 mm (197.09 in.) |
| Width | 1995 mm (78.54 in.) |
| Width including mirrors | 2190 mm (86.22 in.) |
| Height | 1708 mm (67.24 in.) |
| Wheelbase | 2996 mm (117.95 in.) |
| Front track | 1679 mm (66.1 in.) |
| Rear (Back) track | 1687 mm (66.42 in.) |
| Front overhang | 987 mm (38.86 in.) |
| Rear overhang | 1023 mm (40.28 in.) |
| Drag coefficient (Cd) | 0.34 |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Tiptronic |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 285/45 R21 113Y XL |
| Wheel rims size | 10J x 21 |
Powertrain & Engine Architecture
The heart of the SQ8 4.0 TDI is the DMVA engine, a 4.0-liter twin-turbocharged diesel V8. This engine utilizes a common-rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The engine boasts 32 valves (four per cylinder) and a high compression ratio of 16:1. The twin-turbocharger setup employs a primary turbocharger for low-end response and a secondary turbocharger to maintain power at higher engine speeds. Intercooling is employed to reduce intake air temperatures, further enhancing performance. The eight-speed Tiptronic automatic transmission is specifically tuned for the high torque output of the diesel engine, offering smooth and relatively quick shifts. It features a torque converter and allows for manual gear selection via steering wheel-mounted paddles.
Driving Characteristics
The SQ8 4.0 TDI delivers a remarkably smooth and powerful driving experience. The 900 Nm (663.81 lb-ft) of torque, available from a low 1250 rpm, provides effortless acceleration in virtually any gear. The eight-speed Tiptronic transmission is well-matched to the engine, providing seamless gear changes and contributing to the car’s refined character. While not as overtly sporty as the RS Q8, the SQ8 offers a confident and capable driving experience, with excellent stability and grip thanks to the quattro all-wheel-drive system. The gear ratios are optimized for both acceleration and highway cruising, making it a comfortable long-distance vehicle. Compared to the standard Q8’s engines, the SQ8 offers a significantly more potent and responsive driving experience. It also feels more planted and composed than the Q8 variants with air suspension.
Equipment & Trim Levels
The SQ8 4.0 TDI came generously equipped as standard. Interior features typically included Valcona leather upholstery, heated and ventilated front seats with massage function, a panoramic sunroof, and a premium Bang & Olufsen sound system. The Audi Virtual Cockpit, a fully digital instrument cluster, was also standard. Infotainment was handled by Audi’s MMI touch response system, featuring dual touchscreens. Optional extras included carbon fiber trim, extended leather packages, and various driver-assistance systems such as adaptive cruise control and lane-keeping assist.
Chassis & Braking
The SQ8 features an independent multi-link suspension at both the front and rear axles. Adaptive air suspension was standard, allowing the ride height to be adjusted for comfort or performance. The suspension settings could be altered via Audi’s drive select system. Braking duties were handled by large, ventilated disc brakes on all four wheels. The front brakes featured six-piston calipers for enhanced stopping power. ABS (Anti-lock Braking System) and electronic stability control were standard safety features.
Market Reception & Comparison
The SQ8 4.0 TDI was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and luxurious interior. However, some reviewers noted that the diesel engine, while potent, lacked the emotional appeal of a gasoline V8. Compared to the petrol-powered SQ8 variants, the TDI offered superior fuel economy and torque. Against competitors like the Porsche Cayenne Diesel and BMW X6 M50d, the SQ8 offered a compelling combination of performance, luxury, and technology. Fuel economy figures of around 8.9-9.3 l/100 km (26.4-25.3 US mpg) were competitive for a vehicle of its size and performance.
Legacy
The 4.0 TDI engine in the SQ8 has proven to be a robust and reliable powertrain, although, as with any modern diesel, it is susceptible to issues related to the diesel particulate filter (DPF) and AdBlue system if not properly maintained. The SQ8 4.0 TDI holds its value reasonably well in the used car market, appealing to buyers seeking a high-performance, luxurious SUV with good fuel economy. Its blend of performance, comfort, and technology continues to make it a desirable option for those looking for a premium SUV experience.
